scanner.c

cg编译器

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// scanner.c
//

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#if 0
#include <ieeefp.h>
#else
#define isinff(x) (((*(long *)&(x) & 0x7f800000L)==0x7f800000L) && \
                   ((*(long *)&(x) & 0x007fffffL)==0000000000L))
#endif

#include "slglobals.h"

const char *Build_Date = __DATE__;
const char *Build_Time = __TIME__;

typedef struct FileInputSrc {
    InputSrc            base;
    FILE                *fd;
    char                save_cnt;
    char                save[3];
} FileInputSrc;

typedef struct StringInputSrc {
    InputSrc base;
    char *p;
} StringInputSrc;

static int eof_scan(InputSrc *is)
{
    return EOF;
} // eof_scan

static void noop(InputSrc *in, int ch) {}

static InputSrc eof_inputsrc = { 0, &eof_scan, &eof_scan, &noop };

static int byte_scan(InputSrc *);
static int nextchar(FileInputSrc *);
static void ungetchar(FileInputSrc *, int);

#define EOL_SY '\n'

#if defined(_WIN32)
#define DBG_BREAKPOINT() __asm int 3
#else
#define DBG_BREAKPOINT()
#endif

#if defined(_WIN32)
__int64 RDTSC ( void ) {

    __int64 v;

    __asm __emit 0x0f
    __asm __emit 0x31
    __asm mov dword ptr v, eax
    __asm mov dword ptr v+4, edx

    return v;
}
#endif

int InitScanner(CgStruct *Cg)
{
    // Add various atoms needed by the CPP line scanner:
    if (!InitCPP())
        return 0;

    Cg->mostRecentToken = 0;
    Cg->tokenLoc = &Cg->ltokenLoc;

    Cg->ltokenLoc.file = 0;
    Cg->ltokenLoc.line = 0;
    Cg->errorCount = 0;
    Cg->warningCount = 0;
    Cg->lineCount = 0;
    Cg->AllowSemanticParseErrors = 0;

    Cg->currentInput = &eof_inputsrc;

    return 1;
} // InitScanner

int SetInputFile(const char *fname)
{
    FileInputSrc *in = malloc(sizeof(FileInputSrc));
    memset(in, 0, sizeof(FileInputSrc));
    if (fname) {
        if (!Cg->options.Quiet)
            printf("%s\n", fname);
        in->base.name = LookUpAddString(atable, fname);
        in->fd = fopen(fname, "r");
        if (!in->fd) {
            printf(OPENSL_TAG ": cannot open input file \"%s\"\n", fname);
            free(in);
            return 0;
        }
    } else {
        in->fd = stdin;
        in->base.name = LookUpAddString(atable, "<stdin>");
    }
    in->base.line = 1;
    in->base.scan = byte_scan;
    in->base.getch = (int (*)(InputSrc *)) nextchar;
    in->base.ungetch = (void (*)(InputSrc *, int)) ungetchar;
    in->base.prev = Cg->currentInput;
    Cg->currentInput = &in->base;
#if 0 && !defined(_DEBUG)
    if (Cg->options.TraceScanner) {
        __int64 s,e;
        s = RDTSC();
        while (Cg->currentInput->scan(Cg->currentInput) > 0)
            /* empty statement */ ;
        e = RDTSC();
        printf("%d cycles\n", (int)(e-s));
        return 0;
    }
#endif
    return 1;
} // SetInputFile

static int str_getch(StringInputSrc *in)
{
    if (*in->p)
        return *in->p++;
    Cg->currentInput = in->base.prev;
    free(in);
    return ' ';
} // str_getch

static void str_ungetch(StringInputSrc *in, int ch) {
    if (in->p[-1] == ch) in->p--;
} // str_ungetch

int ScanFromString(char *s)
{
    StringInputSrc *in = malloc(sizeof(StringInputSrc));
    memset(in, 0, sizeof(StringInputSrc));
    in->p = s;
    in->base.line = 1;
    in->base.scan = byte_scan;
    in->base.getch = (int (*)(InputSrc *))str_getch;
    in->base.ungetch = (void (*)(InputSrc *, int))str_ungetch;
    in->base.prev = Cg->currentInput;
    Cg->currentInput = &in->base;
    return 1;
} // ScanFromString;

int FreeScanner(CgStruct *Cg)
{
    FinalCPP();
    if (Cg->warningCount || Cg->errorCount || !Cg->options.Quiet) {
        fprintf(Cg->options.listfd, "%d lines", Cg->lineCount);
        if (Cg->warningCount)
            fprintf(Cg->options.listfd, ", %d warnings", Cg->warningCount);
        fprintf(Cg->options.listfd, ", %d errors.\n", Cg->errorCount);
    }
    return Cg->errorCount;
} // FreeScanner

int GetErrorCount(void)
{
    return Cg->errorCount;
} // GetErrorCount

/*
 * bumpErrorCount() - Useful for setting breakpoints when debugging.
 *
 */

void bumpErrorCount(void)
{
    Cg->errorCount++;
    if (Cg->options.TrapOnError) {
        DBG_BREAKPOINT();
    }
} // bumbErrorCount

/*
 * bumpWarningCount() - Useful for setting breakpoints when debugging.
 *
 */

void bumpWarningCount(void)
{
    Cg->warningCount++;
    if (Cg->options.TrapOnError) {
        DBG_BREAKPOINT();
    }
} // bumpWarningCount

// Called by yyparse on an error:

void yyerror(const char *s)
{
    if (!Cg->options.ErrorMode) {
        if (Cg->ltokenLoc.file) {
            fprintf(Cg->options.listfd, "%s(%d) : error C0000: ",
                    GetAtomString(atable, Cg->ltokenLoc.file), Cg->ltokenLoc.line);
        } else {
            fprintf(Cg->options.listfd, "(%d) : error C0000: ", Cg->currentInput->line);
        }
        fprintf(Cg->options.listfd, "%s at token \"%s\"\n", s,
                GetAtomString(atable, Cg->mostRecentToken));
        Cg->AllowSemanticParseErrors = 1;
    }
    bumpErrorCount();
} // yyerror

/*
 * SemanticParseError() - Compiler generated semantic error inside an error rule.
 *
 */

void SemanticParseError(SourceLoc *loc, int num, const char *mess, ...)
{
    va_list args;

    if (Cg->AllowSemanticParseErrors) {
        if (!Cg->options.ErrorMode) {
            if (loc->file) {
                fprintf(Cg->options.listfd, "%s(%d) : error C%04d: ",
                        GetAtomString(atable, loc->file), loc->line, num);
            } else {
                fprintf(Cg->options.listfd, "(%d) : error C%04d: ", loc->line, num);
            }
            va_start(args, mess);
            vfprintf(Cg->options.listfd, mess, args);
            va_end(args);
            fprintf(Cg->options.listfd, "\n");
            bumpErrorCount();
        } else {
            MarkErrorPosHit(loc);
        }

        Cg->AllowSemanticParseErrors = 0;
    }
} // SemanticParseError

/*
 * SemanticError() - Compiler generated semantic error.
 *
 */

void SemanticError(SourceLoc *loc, int num, const char *mess, ...)
{
    va_list args;

    if (!Cg->options.ErrorMode) {
        if (loc->file) {
            fprintf(Cg->options.listfd, "%s(%d) : error C%04d: ",
                    GetAtomString(atable, loc->file), loc->line, num);
        } else {
            fprintf(Cg->options.listfd, "(%d) : error C%04d: ", loc->line, num);
        }
        va_start(args, mess);
        vfprintf(Cg->options.listfd, mess, args);
        va_end(args);
        fprintf(Cg->options.listfd, "\n");
        bumpErrorCount();
    } else {
        MarkErrorPosHit(loc);
    }
} // SemanticError

/*
 * InternalError() - Internal compiler error.
 *
 */

void InternalError(SourceLoc *loc, int num, const char *mess, ...)
{
    va_list args;

    if (loc->file) {
        fprintf(Cg->options.listfd, "%s(%d) : error C%04d: ",
                GetAtomString(atable, loc->file), loc->line, num);
    } else {